Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions

Paudel, Keshab Raj; Johnson, Brian; Thieme, Mattson; Haley, Michael M.; Payne, Marcia M.; Anthony, John E.; Ostroverkhova, Oksana

doi:10.1063/1.4891758

Cited by 30 publications

(52 citation statements)

References 30 publications

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“…1(b)). 10 In these films, ADT-TES-F crystallites had a predominant (00l) orientation (l =1, 3,4), in agreement with previous studies. 6 The ADT-TES-F/PCBM (9:1) blends exhibited crystalline domains of PCBM (inset of Fig.…”

Section: Sample Preparationsupporting

confidence: 89%

“…In contrast, the addition of Pn-TIPS-F8 to ADT-TES-F reduced the crystalline order of ADT-TES-F, as discussed in our previous publication. 10 Films with P3HT did not show any significant crystalline order, which is expected from P3HT-based films which have not undergone a high-temperature annealing process. 11…”

Section: Sample Preparationmentioning

confidence: 77%

“…The choice of the relative D and A concentrations in the ADT-TES-F/PCBM blend was due to the highest photocurrents being achieved in ADT-TES-F/PCBM blends with PCBM concentrations in the 7-10 wt% range. 10 The D/A film samples were prepared by spin-casting 10 µL of the solution at 3000 rpm for 30 seconds on glass substrates with 10 pairs of Cr/Au (5 nm/50 nm thick) interdigitated gold electrodes with a 25 μm gap. Just before spin-casting, each substrate was treated with pentafluorobenzenethiol (PFBT), which was found to form a selfassembled monolayer on the substrate and facilitate crystallization in fluorinated SMs such as ADT-TES-F. 9 No annealing procedures were applied to any of the samples.…”

Section: Sample Preparationmentioning

confidence: 99%

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Charge carrier dynamics in small-molecule- and polymer-based donor-acceptor blends

et al. 2014

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We present a comparative study of optical absorption, photoluminescence (PL), and photoconductivity in bulk heterojunctions comprising a high performance functionalized anthradithiophene (ADT) derivative or the benchmark polymer P3HT as donor and functionalized pentacene (Pn) derivative or PCBM as acceptor. Of all D/A blends studied, the ADT/PCBM blend exhibited the highest charge photogeneration efficiencies under 532 nm excitation, leading to the highest amplitudes of time-resolved and continuous wave (cw) photocurrents. At nanosecond time scales after photoexcitation, both ADT-TES-F-based blends and the P3HT/Pn-TIPS-F8 blend exhibited photocurrents which were higher by a factor of 2-10, depending on the blend, than that in the P3HT/PCBM blend. However, cw photocurrents showed a different trend, with the ADT-TES-F/PCBM blend exhibiting only a factor of ~2.5 higher photoresponse than that in the P3HT/PCBM blends, and the ADT-TES-F-and P3HT-based blends with Pn-TIPS-F8 showing a factor of ~1.5-2.5 lower photoresponse than that in the P3HT/PCBM blend, due to other contributions, such as that of charge trap-limited transport, to cw photoresponse.

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Section: Sample Preparationsupporting

confidence: 89%

Section: Sample Preparationmentioning

confidence: 77%

Section: Sample Preparationmentioning

confidence: 99%

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Charge carrier dynamics in small-molecule- and polymer-based donor-acceptor blends

et al. 2014

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“…Similar improvement in solar cell performance of other small molecule donor materials as a consequence of thermally favored solid state packing has been reported. 48,49 After an annealing procedure of 2 min at 130 °C on a hot plate, the MHJ showed still a very high J SC , plus a FF which equals the reference BHJ cell, thus leading to an overall improvement of performance to 6.2 %.…”

Section: Molecular Propertiesmentioning

confidence: 98%

Influence of Solid-State Packing of Dipolar Merocyanine Dyes on Transistor and Solar Cell Performances

et al. 2015

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A series of nine dipolar merocyanine dyes has been studied as organic semiconductors in transistors and solar cells. These dyes exhibited single-crystal packing motifs with different dimensional ordering, which can be correlated to the performance of the studied devices. Hereby, the long-range ordering of the dyes in staircase-like slipped stacks with J-type excitonic coupling favors charge transport and improves solar cell performance. The different morphologies of transistor thin films and solar cell active layers were investigated by UV-vis, AFM, and XRD experiments. Selenium-containing donor-acceptor (D-A) dimethine dye 4 showed the highest hole mobility of 0.08 cm(2) V(-1) s(-1). BHJ solar cells based on dye 4 were optimized by taking advantage of the high crystallinity of the donor material and afforded a PCE of up to 6.2%.

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“…Spectralon 50 and 100 % reflectance standards from LabSphere, Inc. were used as references with known diffuse reflectance properties. Fluorescence in the vanes was excited with a UV part of solar AM 1.5G radiation (280-400 nm) (solar simulator with AM1.5G filter, dichroic mirror Oriel 81045 and a UV band-pass filter Oriel 81046) and measured in the same geometry as reflectance (Platt et al 2009(Platt et al , 2011Paudel et al 2014). Similar measurements of fluorescence were performed using UV lamp (360-400 nm) and outdoor sunlight with a UV band-pass filter (Oriel 81046) as excitation sources and yielded identical emission spectra.…”

Section: Measurements Of Optical Properties Of Trapsmentioning

confidence: 99%

Visual outdoor response of multiple wild bee species: highly selective stimulation of a single photoreceptor type by sunlight-induced fluorescence

Rao

Ostroverkhova

2015

J Comp Physiol A

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Bees have ultraviolet (UV), blue and green photoreceptor types in their compound eyes with which they locate food sources in landscapes that change continuously in cues emanating from plants and backgrounds against which they are perceived. The complexity of bee vision has been elucidated through studies examining individual species under laboratory conditions. Here, we used a bee-attractive fluorescent blue trap as a model for analyzing visual signals in operation outdoors, and across bee species. We manipulated trap color (appearance to humans under light with weak UV component) and UV-induced fluorescence emission, and aligned field capture results with bee vision models. Our studies show that the bees were attracted to traps that under solar illumination exhibited strong fluorescence emission exclusively in the blue spectral region. Through quantitative analysis, we established that strong spectral overlap of trap emittance with the photosensitivity characteristic of the blue receptor type and minimal overlap with those of the other two receptor types is the most critical property of attractive traps. A parameter has been identified which predicts the degree of attractiveness of the traps and which captures trends in the field data across wild bee species and for a diversity of backgrounds.

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Enhanced charge photogeneration promoted by crystallinity in small-molecule donor-acceptor bulk heterojunctions

Cited by 30 publications

References 30 publications

Charge carrier dynamics in small-molecule- and polymer-based donor-acceptor blends

Charge carrier dynamics in small-molecule- and polymer-based donor-acceptor blends

Influence of Solid-State Packing of Dipolar Merocyanine Dyes on Transistor and Solar Cell Performances

Visual outdoor response of multiple wild bee species: highly selective stimulation of a single photoreceptor type by sunlight-induced fluorescence

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